Aberdeen boss Jimmy Calderwood slammed Hearts matchwinner Christian Nade as 'lazy' after yesterday's 1-0 defeat.
As Aberdeen's defenders pushed up to the halfway line, Nade stayed in behind them, being left with a clear run on goal when the ball was miscontrolled by Duff.
Calderwood said: "To be honest Nade has been lazy and if that was my player, I wouldn't have been too happy about it.
"He has got the break and that's the kind of goal that wins this type of game."